Computing device



Aug. 12,1924.

A. LOBATQ COMPUTING DEVICE Filed Aug. 15A. 1923 Patented Aug. 12, 1924.

UNTE. STATES ALBERTO LOBATO, OF ANTONTO, COLORADO.

COMPUTING DEVICE.

Application led August 15, 1923. Serial No. 657,630.

To all whom t may concern:

Be it known that I, ALBERTO LoBAfro, a citizen of the United States, residing at Antonito, in the county of Conejos and State of Colorado, have invented certain new and useful Improvements in Computing Devices, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in computing devices and it is primarily an object of the invention to provide a novel and improved device of this general character operable to indicate the amount of interest due at a certain rate upon a given sum within a particular period of time.

1t is also an object of the invention to provide a novel and improved device of this general character wherein is employed a stationary group of time indications together with a chart movable with respect thereto, said chart having produced thereon a series of valuations and wherein each valuation of the series has associated therewith in accordance with the time indications, interest computations at different rates corresponding with the time indications together with a movable index or pointer having means thereon to denote the different rates of interest.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved computing device whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

rThe novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, 1 will now proceed to describe the same with reference to the accompanying drawings, wherein Figure 1 is a view in top plan illustrating a computing device constructed in accordance with an embodiment of my invention;

Figure 2 is a sectional view on a reduced scale taken substantially on the line 22 of Figure 1;

Figure 8 is a fragmentary view in plan of the sheet or web as herein embodied.

As disclosed in the accompanying drawings, C denotes a casing or housing of requisite dimensions and which is provided in its upper wall with an opening 1 of requisite diameter, said opening being preferably oblong.

Rotatably supported within the casing or housing C adjacent to the longitudinal margins of the opening 1 are the rollers 2 and 3 having their upper points substantially co-planar with the forward roller 2 preferably of a relatively large diameter.

Each of the rollers 2 and 3 is mounted upon a shaft 4 and engageable with an end portion of said shaft is a crank 5 for im parting requisite rotation to said shaft. The crank is freely and rotatably mounted upon the shaft 4 and is provided at its inner end with a clutch member 6 adapted to interlock with a clutch member 7 carried by the shaft 4. The clutch member 6 of the crank 5 is normally maintained free of the clutch member 6 of the shaft a through the instrumentality of the spring 8.

interposed between the rollers 2 and 3 and operatively engaged therewith is a ilexible sheet or web 9, said sheet or web 9 also underlying the opening 1. Produced transversely across each end portion of the sheet 9 is a series of valuations 10 preferably in dollars, said valuations being progressively increased from the bottom toward the top. rlhe valuations 10 are preferably at the right side of the opening 1 and exposed therethrough.

The portion of the top of the casing or housing C defining the lower margin of the opening 1 has produced thereon at points spaced longitudinally thereof a series of time indications 11 herein disclosed as days and progressively increased by five from the left end of the web or sheet 9 to the right side of the web or sheet.

Disposed transversely of the web or sheet 9 or more particularly of the opening 1 and in alignment with each of the time indications 11 is a column of interest computations 12. Three adjacent computations in such column are associated with a value indication 10. Each of said threecomputations giving the amount of interest due on such value indication for the period determined by the time indication 11 at the bottom of the column of interest computations 12. As herein disclosed each series of three computations 12 giving the amount of interest at four per cent, six per cent and ten per cent.

An elongated index member M is adapted to be disposed transversely across the opening 1 and freely shiftable lengthwise thereof. A marginal portion of the member M is provided With three longitudinally spaced fingers or pointers 14, said pointers or fingers 14 being spaced apart in accordance with the spacing of the interest computations 12 in each series of three. Produced on the member M adjacent each of the fingers or points 14 is an indication 5 to denote the rate of interest,

In practice, presuming it is desired to determine the interest due on $400 at 4% for.

335 days, the roller 2 is rotated until the $400 value shows through the opening 1. The member M is then moved over the opening 11until it indicates 335 days and the nger or pointer 14 identified as 4% shows that the-interest due to be $14.67.

From the foregoing description it is thought to beobvious that a computing device-constructed in-accordance With my invention vis Y particularly Well. adapted for use by reason of thel convenience and facility With which it may be assembled and operated, and it Will also be obvious that my invention is susceptible of some change and modification Without departing from the: principles-and spiritthereof and for this reason I do not Wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice eX- cept as hereinafter claimed.

I claim:-

An interest computing device comprising a shift-able Web, a series of valuations disposed along a side marginal portion of t-he Web, a Winden7 disposed transversely across the web through which a portion of the web is adapted to be exposed, stationary time indications disposed transversely of the Web and arranged adjacent margin of the WindoW, columns of interest computations disposed lengthwise of the Web, each of said columns being aligned With a time indication, said columns of interest computations being divided into a plurality of series, the computations of each serie, being disposed longitudinally of the web, the Window being of a length substantially equal to the width of the Web and of a length substantially equal to the space occupied by a series of computations in a column, the computations of each series indicating the amount of interest at dillerent rates for the adjacent valuation for the period of time denoted by the time indication associated with such series, means for shifting the web, an index member disposed over the Window and having movement in a direction transversely of the Web, the portion of the member disposed over the Window being provided With fingers of a number equal to the number of computations in each series of interest computations in a column, said iingers being provided with interest indications, said indications being of different rates.

ln testimony whereof I hereunto afiix my signature,

ALBERTO LOBATO. 

